Calculate takes times between travel between two cities c + +

#include<iostream.h>
#include<conio.h>
class distance
{
private:
int dist,avg_speed,hour,min,tot_min;
public:
void input();
void rule();
void display();
};
void distance::input()
{
cout<<"\n Enter distance between two cities=";
cin>>dist;
cout<<"\n Enter your vehicle speed=";
cin>>avg_speed;
}
void distance::rule()
{
tot_min=dist*60/avg_speed;
hour=tot_min/60;
min=tot_min-hour*60;
}
void distance::display()
{
cout<<"\n total minute:"<<tot_min;
cout<<"\n Hour to travel:"<<hour;
cout<<"\n minute to travel:"<<min;
}
int main()
{
distance d;
clrscr();
d.input();
d.rule();
d.display();
getch();
return 0;
}